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Date: Sun, 26 Apr 2015 09:54:50 -0700 (PDT)
From: Andrew Munn <andrew@nmedia.net>
To: users@pdfbox.apache.org
Subject: Re: PDFBox detecting checked/unchecked checkboxes
In-Reply-To: <553C8500.4080101@t-online.de>
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 <553C8500.4080101@t-online.de>
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On Sun, 26 Apr 2015, Tilman Hausherr wrote:
> Am 26.04.2015 um 07:10 schrieb Andrew Munn:
> > Is there some trick to this stuff that I should know?
> 
> Yes, "acroform". See the PrintFields example in the source package :-)
> 

I think I looked at that a while back and didn't get anyplace.  I just 
tried to run the PrintFields app and I get a NullPointerException.  I am 
thinking the checkboxes in my form are just stored as black squares, not 
completed form fields.   Is that possible?

        PDDocumentCatalog docCatalog = pdfDocument.getDocumentCatalog();
        PDAcroForm acroForm = docCatalog.getAcroForm(); // returns null
        List<PDFieldTreeNode> fields = acroForm.getFields(); //NPE here

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